Spark-plug.



A. P. BROOMELL.

SPARK PLUG. APPLICATION FVILED JAN-12.1916- Patented Oct. 23, 1917.

5 ewa wim/5885s;

BY ATTORNEYS www@ may be long or shortas practice may rel quire.

Having thus described my device the operation thereof is as' follows z-lVhen it is necessary to prime the engine, a quantity ot' gasolene is poured into the cup 13. `When the engine piston makes its intake stroke it creates a suction in the cylinder chamber Which acts on the Valve-like electrode l,

drawing it away `from its seat l2 and admit-V ting a portion of the gasolene in the eup 13. The passage ist is made ample enough to permit the gasolene to l'low around the post 15.

The electrode will soon re-seat itself and when the piston compresses the charge to the limit, aspark leaps aeross the gap between the terminals lland i, and explodes the compressed charge. Eaeh .time that the piston travels on its intake, stroke, a. suction is created which arts on the electrode l and urges it from its seat 12 against the tension of the spring 1G and thus a small amount of fresh air is admitted each timewhifh not only improves the mixture, but boosts the power and keeps the spark terminals eool.

The Continued reoiproeatory movement of the electrode #l also dislodges any earbon which may have adhered to the parts and is an active ineans'in preventing the formation of carbon deposits around the plug.

claim:-

1. In a spark plugfor internal combustion engines, the combination of an insulatingcore having` a borejherethrough, a valve for normally @losing one end of the bore, a reservoir for a priming uid connected with .said bore, said Valve being automatically opened at the intake stroke of the engine.

2. ln. a spark plug for internal combustion engines, an insulating Core having` an open ing therethrough, a valve for normally clos` ing,` the opening, a reservoir carried by the Core at the opposite end thereof from the valve, said reservoir being` in communication with the opening, and said valve being antoinatieally opened at the intake stroke ofthe engine piston. A

3. In a spark plug for internal combustion engines, an insulating core having` a longitudinal bore therethrough, a valve for normally closing one end of said bore, a sparking terminal Carried by the valve, a terminal post secured to said valve and loosely disposed within saidbore arranged ior longitudinal movement, a spring carried by said terminal post for normally ,holding the valve on its seat, and a cup-carried by the CoreI at the end opposite the valve and having eoini'nnnieatiou with the bore.

4. A spark plus'` Comprising a bushing,- havingh one end internally threaded and provided with an annularI internal shoulder, an elongated insulatingbody havinga central bore and an annular'shoulder and mounted in the bushing, saidbody having a Cup at one end and its other end reduced and forming a -alve seat, a second bushing externally threaded and serewing into the first bushing` a terminal post loosely 'mounted in the bore of the insulating body witlr its 'ends project ing bevond said body, a nut on the upper end of pos a spi-ino on the post between the nut and the end ot said body, and an eleetrmle on the lower end of the post and forming a.

valve adapted to be seated on the lower reduced end ot' the insulating body. A

. A spark plug' eonrprising a bushing, an

elongated insulating body mounted in the i bushing and having,r a central bore, a reduced lower end torming a valve seat, and a cup at its upper end into which lleads the bore, a

terminal post loosely mounted in the bore ols the insulating body with its lower end projecting beyond the lower end ot said body and its upper end projecting through said cup, a nut-on the -upper end of the post. als'i'iring on the rodlbetiveen the nut and the endet the body, and an electrode on the .lower end of the post and formingl ay seat adapted to be seated against the lower end ot' the. body.

(l. A spark plug', comprising' a bushing', an

`elongated insulating body mounted in the bushing' and having a central bore and its lower end formed into a valve seat, a looselv mounted and spring pressed terminal post in the bore oit' the insulzning` body, and an electrode on the lower end o1" the post and forming' a valve and adapted to be seated on the seat at the ldvver end of said bodv.

LBE l?. BROth/l'llili. 

